AIR PURIFIER
An air purifier system characterized by a housing, a fan, and a motor, as well as a docking ring located at the outer edge of the inlet side of the air purifier system, a seat below the housing, a prefilter or barrier upstream of the fan, and a filter downstream of the fan. An air purifier system characterized by an upstream-to-downstream airflow path that includes an axial fan, a diffuser, and a filter, in that relative order, with an electric motor held along the centerline of the housing by one or more supports and/or guide vanes. A docking ring that facilitates attachment of a screen-like, mesh-like, cloth-like, or paper-like filter to a machine capable of air purification, characterized by having a large hole through which air passes and by attachment to the machine utilizing any tongue and groove system, for which installation and removal of the docking ring is achieved, in whole or in part, by rotation of said docking ring relative to the machine.
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This application is a continuation-in-part of International Application PCT/CN2016/098851, with an international filing date of Sep. 13, 2016, now pending, which claims priority to People's Republic of China Application (CN) 201510581044.2, with a filing date of Sep. 13, 2015.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNot Applicable
THE NAMES OF THE PARTIES TO A JOINT RESEARCH AGREEMENTNot Applicable
REFERENCE TO A “SEQUENCE LISTING,” A TABLE, OR A COMPUTERNot Applicable
BACKGROUND OF THE INVENTION (1) Field of InventionThe present invention relates to the field of air purification.
(2) Description of Related ArtExisting air purifiers use different techniques to remove particulate matter from the air, including placing a positive or negative charge on a particle and the reverse charge on a collection plate. These ionic air purifiers are efficient, but ionized particles escape from into the air and damage lung tissue. Other air purifiers use thin or coarse filters to reduce flow resistance and improve volumetric flow rate. Unfortunately, they don't effectively filter very small (PM 2.5) particles, which can permanently degrade lung function over time. Air purifiers with thick and fine filters (HEPA and HEPA-like) work, but pushing air through thick and fine filters consumes a lot of energy, which is exacerbated by mediocre-to-poor aerodynamic design.
The correct type of fan must be selected to maximize performance. The preferred fan (axial, mixed, centrifugal) depends on a combination of parameters and the Cordier Diagram. For typical low occupancy air filtration cases an axial fan maximizes potential performance and efficiency. Despite this, almost all existing low occupancy air purifiers use centrifugal fans.
Existing purifiers include: elbows, bends, corners, loops, blunt plastic grates, flow constriction through sharp holes/openings, discontinuous surfaces, flow obstructions without fairings (i.e. motors), fans with inappropriate geometry, and/or long ducting. Axial fans are sensitive to spoiled flow and would not perform well in these air purifiers. Centrifugal fans, on the other hand, are not sensitive to spoiled flow. Air purifiers with high flow resistance (e.g. having a HEPA-like filter) use centrifugal fans almost exclusively. In so doing, they accept lower energy efficiency. In addition, centrifugal fans work at higher rotation rates, which is associated with greater noise production.
A few air purifiers utilize axial fans with HEPA-like filters. They consist of a HEPA-like filter strapped to the front of an off-the-shelf desktop fan; they consume electricity while being of almost no benefit to their users.
Existing air purifiers use custom, oddly-sized, or oddly-shaped replacement filters, which allow air purification companies to charge high prices for them. If the custom filter becomes unavailable then the entire air purification system becomes unusable.
BRIEF SUMMARY OF THE INVENTIONThe present invention is directed to an air purifier system. A simple embodiment of the air purifier, as depicted in
The fan (6) is surrounded by a housing (15) that improves fan (6) effectiveness near its blade tips. This is done by reducing tip vortices, which are caused by flow acceleration from the high-pressure side (downstream) of the blades to their low-pressure side (upstream) around blade tips. The fan (6) is driven by a motor (13). It represents the aerodynamic heart of the air purifier system, providing energy to the flow and pushing air downstream. Custom fan (6) design is critical to overall system performance. The flow must approach blades tangent to their leading edges (28), flow over blades without separation, and leave tangent to the blade's trailing edges (29).
A filter (16) can remove virtually all of the dust from the air, including tiny particles smaller than 2.5 microns in characteristic diameter. Outgoing air is clean and healthy, and the energy consumed by the motor (13) is reasonably low.
The high efficiency embodiment of
The inlet (7) allows flow to smoothly enter the housing without separation, which would cause “vena contracta” and reduce the fan's (6) efficiency near its blade tips. (31). The hub dome (34) allows flow to remain attached as it approaches blade roots (30) to improve fan (6) efficiency in that region. The motor cover (14) allows the flow to travel smoothly over the motor without separation.
The fan (6) introduces “swirling” (a circumferential velocity component) into the flow due to its rotation. This circumferential velocity component does not contribute to axial flow through the filter (16) and represents wasted energy. Guide vanes (5) force the circumferential flow to travel in a purely axial direction to recover kinetic energy that would otherwise be wasted.
The diffuser (24) decelerates the flow without causing separation along its walls. As the flow decelerates through the diffuser (24) its static pressure increases and reaches a maximum just behind the filter (16). The flow rate through the filter (16) is proportional to the static pressure behind it.
The air purifier system provides a technical solution for ventilation and purification, which is achieved by placing the air purifier system on a windowsill or stand (40) and using the height and level adjusters (11) to align the docking ring (4) with an air inlet hole (35), as seen in
The air purifier system provides a technical solution to the non-multifunctional nature of existing air purifier systems.
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- a. In-room filtration—in lightly occupied spaces, the air purifier system can be placed anywhere and turned-on.
- b. Personal desktop filtration—in heavily occupied spaces, the air purifier system can be placed on a desk and directed towards an individual's face for personal air filtration.
- c. Desktop cooling—do the same as for b. but remove the filter (16).
- d. Forced ventilation and filtration—align the air purifier system with an air inlet hole (35) and run it. If the room is too well-sealed, open a window slightly to allow outflow.
- e. Forced ventilation without filtration—do the same as for d. but remove the filter (16).
Compared with the prior art, the air purifier system is: energy efficient, versatile, easy to install, and easy to clean. It features low cost manufacturing and filter replacement.
The term “air purifier” is understood to include: air purifiers, ventilation purifiers, air filtration systems, and all other machines capable of filtering particulate matter out of air.
(2) List of Symbols1—carry handle; 2—lid; 3—filter housing; 4—docking ring; 5—motor supports/guide vanes; 6—fan; 7—inlet; 8—speed adjustment knob; 9—prefilter; 10—electrical control box cover; 11—height and tilt adjuster; 111—height adjustment mechanism; 112—tilt adjustment mechanism; 12—electrical control box; 13—motor; 14—motor cover; 141—air vents (on the motor cover); 15—housing; 16—filter; 17—inner ring; 18—outer ring; 19—electrical conduit; 20—wind-blocking sheet; 21—window frame; 22—damper/stiffener; 23—seat; 24—diffuser; 25—hub; 28—blade leading edge; 29—blade trailing edge; 30—blade root; 31—blade tip; 32—blade airfoils; 33—hub ring; 34—hub dome; 341—vents (on the hub dome); 35—air inlet hole; 36—connecting ring; 37—safety cage; 38—hose; 39—timer control knob; 40—windowsill/stand; 41—snaps; 42—skirt; 43—side-panels; 44—threaded elements; 45—rotary switch; 46—capacitor; 47—tongue; 48—groove; 49 protruding part; 50—slot, 51—hub beams; 52—hub sidewall.
(3) Simple EmbodimentThe present invention is directed to an air purifier system, for which
The fan (6) is mounted on the output shaft of the motor (13). There is a prefilter (9) upstream of the fan (6), which can consist of a stainless-steel screen, and a filter (16) located downstream of the fan. The filter (16) is not limited to a HEPA filter, but a HEPA filter is preferred. Toward the outer edge of the prefilter (9) there is a docking ring (4). The docking ring (4) can maintain tension in the prefilter (9) and be used to connect the prefilter (9) to the housing (15). The air purifier system rests on a seat (23), which is located below the fan (6). Height and tilt adjusters (11) connect to the seat (23). The four threaded elements can be turned to provide minute adjustment of the height and tilt of the air purifier system, allowing the docking ring (4) to be easily aligned with a connecting ring (36) during installation at a window, when desired. For special circumstances and applications, the height adjustment mechanism may consist of two tubes that can slide relative to one-another, increasing the total height adjustment range. In this embodiment the docking ring (4) has an annular shape, but the docking ring (4) in-general is not limited to an annular shape.
During simultaneous ventilation and forced filtration air from outside is sucked through the prefilter (9). The prefilter (9) causes a loss of flow energy, but it also reduces turbulence in the outside air. Turbulence reduction partially offsets energy lost through the prefilter because it improves the aerodynamic efficiency of the fan (6). The prefilter (9) is also an important component because it prevents premature clogging of the filter (16) due to insects, fibers, and large dust particles, and it protects both the fan (16), and people's fingers.
The simple embodiment has a square filter housing (3) to accommodate a standard square-shaped filter. The filter housing (3) has a lid (2) with a front lip that covers the front edges of the filter to hold it in place and to prevent dirty air from bypassing the filter (16), leaking into the building, and reducing overall air quality. For the simple embodiment of
The filter (16) can be easily installed into and removed from the filter housing (3) for replacement or cleaning by opening the lid (2) and sliding the filter (16) in or out. For example, the filter housing (3) can have a U shape whose inner-side has a groove for the filter (16) to slide into. The lid (2) is above the filter housing (3). The carry handle (1) is on the upstream side of the lid (2). The filter (16) can be removed to provide high flow-rate pure ventilation, which is useful when the outside air is relatively clean and rapid indoor ventilation is desired, or when the indoor temperature is less comfortable than the outdoor temperature. If there are small children or pets in the home then a safety cage (37) can replace the filter in the filter housing (3). The air purifier system can also include additional filters. Examples include more than one prefiltration layer or a non-mesh type prefilter upstream of the filter (6), as well as an activated carbon filter downstream of the filter (6), which is used to absorb odors and harmful chemical vapors. Further, the air purifier system may include an electrical heating device to increase comfort during cold weather use. The air purifier system can be removed from the window and used on a desktop for pure filtration without ventilation, making it extremely versatile. Users are cautioned that the preferred technique is to filter incoming air before it enters a building, not after it has diffused throughout the building; the former is much more effective and efficient than the latter.
The simple embodiment has an axial fan (6) with a small hub-to-tip ratio. Planar projections of a blade's leading (28) and trailing edge (29), as viewed from downstream looking-in, (
A high efficiency embodiment is shown in
The inlet (7) has a streamlined horn-like shape and it is located between the prefilter (9) and the housing (15). The inlet (7) accelerates the flow and allows the air to flow smoothly into the housing (15) preventing flow separation and reattachment near the housing's (15) otherwise sharp corners, which is called vena contracta. Vena contracta reduces the aerodynamic efficiency of the fan blades (6) near their tips. The net result of the inlet (7) is an improvement in system efficiency on the order of a few percent. The docking ring (4) here is the same as for the simple embodiment.
The high efficiency embodiment includes a diffuser (24) located between the housing (15) and the filter (16). The diffuser (24) is tapered; It has a smaller cross-sectional area on the housing (15) side and a larger cross-sectional area, which may be round, square, or some other shape, on the filter (6) side. The diffuser's (24) smallest cross-section should expand smoothly to its largest cross-section. If the diffuser (24) is too short then flow separation will result, leading to reduced efficiency. If the diffuser (24) is too long then the air purifier system will not balance over a windowsill/shelf without fixing or fastening its legs to the windowsill or shelf. In general, the greater the diffusion area ratio (outlet area divided by inlet area) the greater the required length to avoid flow separation. The diffusion area ratio can be increased without changing the outlet area by increasing the inlet area, which is essentially an annulus from the hub diameter of the fan (6) to the inner diameter of the housing (15). Diffuser (24) considerations encourage a smaller fan (6) hub diameter and a larger tip diameter than might otherwise be used. The diffuser's (24) length is selected ensure that fully-attached flow is maintained on the walls of the diffuser as the flow expands from the smallest cross-section to the largest cross-section of the diffuser (24). For this high efficiency embodiment, the diameter of the upstream circular part of the diffuser (24) is no bigger than that of a side-length on the downstream side. The ultimate effect of the diffuser (24) is to increase the total volumetric flow rate of air through the air purifier system (all else being equal). A logical material choice for the diffuser (24) is plastic. For the high efficiency embodiment of
This high efficiency embodiment utilizes a half ellipsoidal motor cover (14) whose open-end attaches to the guide vanes (5) and whose closed end has air vents (141), which allow motor cooling air to flow out. The flow rate of cooling air is very small, so it does not significantly reduce the efficiency of the entire air purifier system. The motor cover (14) has a continuous surface of continuous slope to avoid flow separation, helping the air downstream of the fan (6) to flow smoothly around the motor (13), thereby reducing flow resistance. Plastic is a logical material choice for the motor cover (14), as well as the other aerodynamic surfaces. Using a rounded hub dome (34), as opposed to a flat hub face, can improve the efficiency of the fan blades near their roots (30).
Vents (341, 141) are placed in the hub dome (34) and the motor cover (14) to allow a small amount of air to flow over the motor (13) for cooling, and to prevent flow separation near the outer downstream face of the motor cover (14). Cooling air flow is driven by suction created just behind the hub dome (34) that arises due to the rotation of radially-oriented hub beams (51) (
The high efficiency embodiment depicted in
For the guide vanes (5) of
The lid (2) has been omitted in favor of using snaps (41) attached to the filter housing (3a, 3b) for installation and removal of the filter (16). A skirt (42) has been added to cover the height and tilt adjusters (11) and two side-panels (43) have been included to further improve the aesthetics of the air purifier. Threaded elements (44) are embedded in the seat (23a, 23b) to mate with the height and tilt adjusters (11). A rotary switch (45) and capacitor (46) are also shown.
The docking ring (4) for all embodiments is the part used to hold the prefilter (9) or barrier in-place; it may or may not be used to facilitate installation of the air purifier system at a window. In practice, the docking ring (4) can have a wide variety of shapes and need-not be annular. In the example embodiment of
Many discrete parts from the
Installation of the air purifier system may include a wind-blocking sheet (20). The wind-blocking sheet (20) has an air inlet hole (35) and may include a connecting ring (36) applied around the air inlet hole (35) that mates in a temporary, easily-removable, fashion with the docking ring (4). The docking ring (4) can also have a locking connection with the connecting ring (36) in a variety of ways, including using: glue, double-sided tape, snaps, screws, magnets, etc. Height and tilt adjusters (11) are used to align the docking ring (4) with the connecting ring (36).
The function of the wind-blocking sheet (20) is to cover the window, allowing ventilation only through the air inlet hole (35). Preferred materials for the wind-blocking sheet are transparent, and may include: glass, rigid plastic, or a flexible material made from a relatively thin film. For a “do-it-yourself” installation using a thin flexible material the material can be received in a roll with the air inlet hole (35) pre-cut and the connecting ring (36) already attached. The sheet (20) could be cut to the necessary frame-size using scissors. After removing an existing window screen its rubber strip and groove can be utilized to tension and mount the flexible wind-blocking sheet (20). Tape can used to help keep the rubber strip in-place, and a transverse stiffener or damper (22), as depicted in
After installing the wind-blocking sheet (20) the air purifier system is set on a corresponding windowsill or stand (40). A no-cost installation of an excellent ventilation purifier has been achieved without the need to drill any holes or install complicated room-to-room ducting. There is no damage to the window, its frame, or any other part of the building. To return the window to its original condition simply remove the unit and reinstall the old window screen.
(7) Fan DesignThe fan (6) is designed such that incoming air approaches nearly tangent to its blade leading edges and flows smoothly over the blades without separation. The precise shape of the blades is designed to maximize efficiency. As air passes through the fan it undergoes a necessary rise in static pressure, which ultimately drives flow through the filter (16). Due to its rotation, the fan (6) also introduces a circumferential velocity component, which is undesirable as it does not contribute to axial flow through the filter.
An embodiment of the fan (6) is depicted in
Embodiments with longer diffusers can tolerate higher fan hub-to-tip ratios without flow separation, allowing higher static pressures and flow rates to be achieved. Such embodiments can also be designed to operate well over a broader range of flow speeds by utilizing more-complex airfoils with non-uniform thickness distributions. For such embodiments the axial fan becomes relatively heavy, and its mass is distributed further away from the axis of rotation. As a result, such fans can be difficult to balance.
(8) Guide Vane DesignFor the high efficiency embodiment depicted in
and the other equation was derived to estimate the post-fan circumferential flow speed, as:
Shape details for the guide vanes (5) (beyond having the proper inlet and outlet angles) are not as important as those of the fan (6). The guide vanes (5) are stationary, causing the flow speed over them to be relatively low. As a result, their shape-effect on system efficiency is reduced. The number of guide vanes (5) is selected to ensure three criterion: (1) that they successfully impose their geometry on the flow, (2) that they adequately support the weight of all mounted components, and (3) that their material use is not excessive. One of the guide vanes (5) is hollow with a thick symmetric airfoil; it serves as the electrical conduit (19) that allows electric wires to run safely from the electric control box (12) to the motor (13) without creating a flow disturbance. The electrical conduit's (19) trailing edge is left open for ease of assembly.
(9) Experimental ResultsTo verify the performance of the air purifier system an initial simple, high efficiency, and manufacturing embodiment were produced and tested alongside a commercial desktop filter. The method for comparison was volumetric flow rate through the filter divided by power consumption in watts, which is an industry standard. This is not a very fair comparison between desktop purifiers and ventilating purifiers, as the technique of filtering incoming air is much more efficient than the technique of letting dirty air enter and then trying to clean it using a desktop filter (after it has diffused throughout a space).
Table 1 compares three embodiments of the air purifier system during experimental operation, where mean power consumption is presented in watts (W). Supply voltage from the local grid (in China) fluctuates, so values are adjusted to correspond to 220V. The mass production embodiment uses a more efficient electrical motor and has four power-settings (not three).
Table 2 compares the performance of different air purifier systems having the same nominal power and voltage for their motors. Niu Kee is a typical commercially-available desktop filtration system utilizing an axial fan.
The flow speed through the filter is proportional to the pressure difference across it, as given on the y-axis of
While the foregoing written description of the invention enables a person having ordinary skill in the art to make and use what is considered presently to be the best mode thereof, those of ordinary skill in the art will understand and appreciate the existence of variations, combinations, and equivalents of the specific embodiment, process, and examples herein. The invention should therefore not be limited by the above described embodiments, processes, and examples, but by all embodiments and processes within the scope and spirit of the invention.
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21. An air purifier system, the air purifier system comprising:
- (a) a housing;
- (b) an axial fan;
- (c) a motor;
- (d) a prefilter;
- (e) a filter;
- (f) a docking ring; and
- (g) a seat;
- (h) where the prefilter is located upstream of the axial fan,
- (i) where the filter is located downstream of the axial fan,
- (j) where the axial fan is placed inside the housing,
- (k) where the seat rests below the housing.
22. The air purifier system according to claim 21,
- (a) the air purifier system further comprising: (i) a plurality of motor supports; and
- (b) wherein the motor comprises: (i) an output shaft;
- (c) where the axial fan is mounted on the output shaft of the motor,
- (d) where the motor supports attach the motor to the housing,
- (e) where the motor supports hold the motor along the centerline of the housing.
23. The air purifier system according to claim 21,
- (a) the air purifier system further comprising: (i) a plurality of guide vanes; and
- (b) wherein the motor comprises: (i) an output shaft;
- (c) where the axial fan is mounted on the output shaft of the motor,
- (d) where the guide vanes attach the motor to the housing,
- (e) where the guide vanes hold the motor along the centerline of the housing.
24. The air purifier system according to claim 21, the air purifier system further comprising:
- (a) a filter housing, the filter housing comprising: (i) a lid; and (ii) a groove;
- (b) where the filter housing is located downstream of the axial fan,
- (c) where the filter slides into the filter housing and is held in-place by the filter housing groove.
25. The air purifier system according to claim 21, the air purifier system further comprising:
- (a) a filter housing, the filter housing comprising: (i) a first filter housing part; (ii) a second filter housing part; and (iii) at least one snap;
- (b) where the first filter housing part and the second housing part are held together by the at least one snap,
- (c) where the filter is held in-place between the first filter housing part and the second housing part,
- (d) where the filter housing is located downstream of the axial fan.
26. The air purifier system according to claim 21, the air purifier system further comprising:
- (a) a diffuser;
- (b) where the diffuser is located between the housing and the filter.
27. The air purifier system according to claim 21, the air purifier system further comprising:
- (a) a horn-shaped inlet;
- (b) where the horn shaped inlet is located downstream of the docking ring,
- (c) where the prefilter is held between the docking ring and the horn-shaped inlet.
28. The air purifier system according to claim 24, the air purifier system further comprising:
- (a) a safety cage;
- (b) where the safety cage slides into the filter housing and is held in-place by the filter housing groove.
29. The air purifier system according to claim 21, the air purifier system further comprising:
- (a) a carry handle;
- (b) where the carry handle is located above the housing.
30. An improved air purifier system, the improved air purifier system comprising:
- (a) a housing;
- (b) an axial fan, comprising: (i) a plurality of fan blades;
- (c) a tapered diffuser;
- (d) a filter;
- (e) a motor;
- (f) a plurality of guide vanes;
- (g) a filter housing; and
- (h) a seat;
- (i) where the diffuser is located between the housing and the filter,
- (j) where the filter is located downstream of the axial fan,
- (k) where the motor is held along the centerline of the housing,
- (l) where the filter housing is located downstream of the axial fan,
- (m) where the seat rests below the housing.
31. The improved air purifier system according to claim 30, the improved air purifier system further comprising:
- (a) a motor cover, comprising: (i) an open-end; and (ii) a closed end, comprising: (1) air vents; and
- (b) wherein the axial fan further comprises: (i) a hub dome, comprising: (1) hub beams; (2) hub sidewalls; and (3) air vents;
- (c) where the motor cover has a continuous surface of continuous slope,
- (d) where the open-end of the motor cover is attached to the guide vanes.
32. The improved air purifier system according to claim 30, the improved air purifier system further comprising:
- (a) a prefilter or a barrier;
- (b) where the prefilter or the barrier is located upstream of the axial fan.
33. The improved air purifier system according to claim 30, wherein the filter housing comprises:
- (a) a lid; and
- (b) a groove;
- (c) where the filter slides into the filter housing and is held in-place by the filter housing groove.
34. The improved air purifier system according to claim 30, wherein the filter housing comprises:
- (a) a first filter housing part;
- (b) a second filter housing part; and
- (c) at least one snap;
- (d) where the first filter housing part and the second housing part are held together by the at least one snap,
- (e) where the filter is held in-place between the first filter housing part and the second housing part.
35. The improved air purifier system according to claim 30,
- (a) where the filter is made from pleated filter paper or pleated cloth.
36. The improved air purifier system according to claim 30, the improved air purifier system further comprising:
- (a) a docking ring;
- (b) where the docking ring is connected to the housing.
37. The improved air purifier system according to claim 36, the improved air purifier system further comprising:
- (a) a horn-shaped inlet;
- (b) where the prefilter is held between the docking ring and the horn-shaped inlet.
38. The improved air purifier system according to claim 30, the improved air purifier system further comprising:
- (a) at least one height and tilt adjuster;
- (b) where the at least one height and tilt adjuster is connected to the seat.
39. An improved docking ring, comprising:
- (a) a plurality of grooves;
- (b) an inner surface;
- (c) where the improved docking ring grooves are located on the inner surface of the improved docking ring.
40. The improved docking ring according to claim 39, further comprising:
- (a) a plurality of slots;
- (b) where the improved docking ring slots are located on the inner surface of the improved docking ring.
41. The improved docking ring according to claim 39,
- (a) where the improved docking ring has substantially annular shape.
42. The improved air purifier system according to claim 30, the improved air purifier system further comprising:
- (a) a docking ring, comprising: (i) a plurality of grooves; and (ii) an inner surface; and
- (b) a horn-shaped inlet, comprising: (i) a plurality of tongues; and (ii) an outer surface;
- (c) where the horn-shaped inlet tongues are located on the outer surface of the horn-shaped inlet,
- (d) where the docking ring grooves are located on the inner surface of the docking ring,
- (e) where the horn shaped inlet is located downstream of the docking ring,
- (f) where the docking ring grooves lock into the horn-shaped inlet tongues,
- (g) where the horn-shaped inlet is connected to the housing.
43. The improved air purifier system according to claim 42,
- (a) wherein the horn-shaped inlet further comprises: (i) a plurality of protruding parts; and
- (b) wherein the docking ring further comprises: (i) a plurality of slots;
- (c) where the horn-shaped inlet protruding parts are located on the outer surface of the horn-shaped inlet,
- (d) where the docking ring slots are located on the inner surface of the docking ring,
- (e) where the horn-shaped inlet protruding parts snap into the docking ring slots.
44. An advanced air purifier system, the advanced air purifier system comprising:
- (a) a housing;
- (b) an axial fan, comprising: (i) a plurality of fan blades;
- (c) a tapered diffuser;
- (d) a filter;
- (e) a motor;
- (f) a plurality of motor supports;
- (g) a filter housing; and
- (h) a seat;
- (i) where the filter housing is located downstream of the axial fan,
- (j) where the motor is held along the centerline of the housing,
- (k) where the filter is located downstream of the axial fan,
- (l) where the diffuser is located between the housing and the filter,
- (m) where the seat rests below the housing.
45. The advanced air purifier system according to claim 44, wherein each fan blade comprises:
- (a) a leading edge;
- (b) a trailing edge;
- (c) a root;
- (d) a tip; and
- (e) a plurality of cylindrical airfoils;
- (f) where the planar projection of each fan blade leading edge is parabolic,
- (g) where the planar projection of each fan blade trailing edge is parabolic,
- (h) where the planar projection of each fan blade root is semi-circular,
- (i) where the planar projection of each fan blade tip is semi-circular,
- (j) where each cylindrical airfoil has a camber-line that is a parabola projected onto a cylindrical surface.
46. The advanced air purifier system according to claim 45, wherein each fan blade further comprises:
- (a) a thickness;
- (b) where the thickness of each fan blade is constant in the circumferential direction,
- (c) where the thickness of each fan blade is linearly-tapered in the radial direction.
Type: Application
Filed: Mar 14, 2018
Publication Date: Jul 19, 2018
Patent Grant number: 10711804
Applicant: Qingdao Randall Aerodynamics Engineering LLC (Jiaozhou City)
Inventor: Ryan Michael Randall (Tucson, AZ)
Application Number: 15/920,613